a nylon hexagonal flange nut with a black rubber seal underneath white backdrop

accessories accessory backdrop background bathroom black bolt bolts fasten fastened fastener fasteners flange flanged gasket gaskets gauge gauges go-no-go hex hexagon hexagonal hold holding imperial inch inches iso isolated leak leakage leakages leaking leaks lock metric nut nuts nylon pipe pipes piping place plastic plug plugged plugs plumber plumbers plumbing rubber seal sealed seals shaped shapes spanner spanners stack stacked system thread threading threads tight tighten tightened toilet torque underneath white wrench wrenches